Date: Sat, 4 Aug 2012 14:12:34 -0500 From: Scot Hetzel <swhetzel@gmail.com> To: Torfinn Ingolfsen <torfinn.ingolfsen@getmail.no> Cc: freebsd-stable@freebsd.org Subject: Re: FreeBSD 9.0 - GPT boot problems? Message-ID: <CACdU%2Bf_Bz3TxCLTXVv9X=-B-D8XwMPHx4VS9QMtUi2NATuy5bg@mail.gmail.com> In-Reply-To: <20120804162341.717ec2bc694758cd0a07412c@getmail.no> References: <8C.9F.08634.CFACC105@smtp01.insight.synacor.com> <20120804162341.717ec2bc694758cd0a07412c@getmail.no>
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On Sat, Aug 4, 2012 at 9:23 AM, Torfinn Ingolfsen <torfinn.ingolfsen@getmail.no> wrote: >> The gpart bootcode command is quite apart from and unrelated to (as far as I can tell) the EFI partition. > > Yes, this is what I have found out too. > >> I think the EFI partition is supposed to be the first partition on a GPT-partitioned disk. > > This is not required by the specification as far as I can tell, but there are writings on the net saying that some implementations > requires this (MS Win7 for example). > > http://msdn.microsoft.com/en-us/windows/hardware/gg463525.aspx Microsoft wants the GPT Disks partitions layouted as: Extensible Firmware Interface System Partition (ESP) ~100MB OEM Partition (optional) Microsoft Reserved Partition (MSR) [Drive <16GB - MSR = 32MB, Drive >= 16GB - MSR = 128MB] - used to reserve space that is later broken in to smaller partition for use by meta data (i.e. dynamic disks) Data Partitions (FAT, NTFS, ...) If these partitions (ESP, OEM and MSR) were mixed in with the Data Partions, then you would be unable to grow the filesystems. Scot
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